Roasting-furnace.



PATENTED JULY 18, 1905. J. A. ANKER, J. H. WATSON 8: P. EVANS. ROASTINGFURNACE.

APPLIOATION FILED DEC. 10. 1903- 4 SHEETS-SHEET 1 afar/166W (dc- :23amPz'awoe Eva/us may clwmmm, Hm;

No. 794,837. PATENTBD JULY 18, 1905. J. A. ANKBR, J. H. WATSON & P.EVANS. ROASTING FURNACE.

APPLICATION FILED DBO. 10, 1903.

4 SHEETS-SHEET 2.

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No. 794,837. PATENTED JULY 18, 1905. J. A. ANKER, J. H. WATSON & P.EVANS. ROASTING FURNACE.

APPLIGATION FILED DBO. 10, 1903.

4 SHEETS-SHEET 3.

Pieree [U ANoRLw u GRAHAM ca Hmuimmwmm wwumron n c No. 794,837. PATENTEDJULY 18, 1905. J. A. ANKER, J. H. WATSON & P. EVANS.

ROASTING FURNACE.

APPLICATION FILED 11110.10, 1903.

4 SHEETS-SHEET 4.

. oil/AW Mew/ 6 (JaSep/o JZ flak? (Jam 1/ [leafy/m NITED STATES PatentedJuly 18, 1905.

PATENT OFFICE.

JOSEPH A. ANKER, JAMES H. WATSON, AND PIERCE EVANS, OF LOS ANGELES,CALIFORNIA; SAID ANKER AND EVANS ASSlGrNOR-S TO SAID WVATSON.

ROASTlNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 794,837, dated July 18,1905.

Application filed December 10, 1903. Serial No. 184,574.

To all whom it may concern.-

Be it known that we, JOSEPH A. ANKER,

. J AMES I-I. WATSON, and PIERCE EVANS, citi- Zens of the United States,and residents of Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented a new and useful Roasting-Furnace, of whichthe following is a specification.

This invention relates especially to a furnace designed for roastingore.-

The main object of this invention is to provide a furnace which is soconstructed that the ore is projected in a thin stream or veil through achamber, so that the stream of ore receives the direct action of a flameand airblast.

Another object of the invention is to provide means for controlling thepassage of the ore through the chamber.

Another object is to provide means whereby an air-blast may beintroduced into the chamber, so as to promote a perfect roasting of theore by driving off fumes and arsenical or other properties in the ore.

Another object is to produce a furnace of the character described inwhich the control ofthe passage of the ore through the chamber iseffected automatically.

Another object is to provide means for the automatic handling of the oreduring its passage through the furnace and delivery therefrom and toprovide means whereby the roasted ore may be taken away from the furnacewith the least amount of labor.

Another object is to provide a roastingchamber of a novel form, which byits contour will deflect the flames during their passage up the chamber,causing them to pulsate, which greatly augments their action upon theore.

Another object is to provide novel means in the form of retaining-shoesfor controlling the passage of ore through the chamber,which may beutilized to the utmost extent and which are susceptible of beingreversed or changed in position, so that when one part of the shoebecomes worn or otherwise unfit for use another part may be brought intoplace.

Another object is to provide means for preventing excessive heating ofthe retainingshoes, which control the passage of the ore through thechamber.

Another object is to provide means whereby the said fuel-controllingmeans or retainingshoes may be expeditiously removed from operativeposition in the furnace for replacement or readjustment.

Other objects of the invention are to produce a furnace which may beconstructed within a relatively small compass compared to otherroastingfurnaces, but which will have a capacity and efficiency equal toor greater than any other roasting-furnace of which we are aware.

Other objects are to provide a furnace which is simple in construction,economical in working, and durable in use.

The accompanying drawings illustrate the invention, and referring to thesame, Figure I is a side elevation of the furnace, the lower left-handportion of the side wall being broken away. Only the spout of the hopperfor feeding the crushed ore to the furnace is shown. Fig. II is a planview of the furnace with the hopper removed. Fig. III is a rearelevation of the furnace. Fig. IV is a vertical section taken throughthat portion of the furnace contiguous the roasting-chamber. Fig. V is asection on line V V of Fig. I. Fig. VI is a plan view of aretaining-shoe. Fig. VII is a detail showing a locking-bar for theretainingshoe. The means which support the lockingbar are shown insection. The dotted lines indicate the outward position of thelockingbar. Fig. VIII is a section on line VIII VIII of Fig. VI. Fig. IXis a detail of the jointed ends of the links.

1 designates a base structure of masonry, which has cross-cuts 2, inwhich tracks are provided for cars 3 for receiving the ore after beingtreated. The furnace proper is built upon the base 1 and preferablyconstructed of brick walls 4:, the cross-section of which is preferablysquare in outline. roasting-chamber is formed vertically through thecenter of the furnace, being relatively restricted in space between thecurved faces and being relatively wide between the flat walls.

A sinuous The upper end of the chamber is constricted at the point wherethe ore is admitted, and its lower end is also constricted at the pointwhere the ore is delivered. A gallery or flue 5 branches from thechamber at the upper portion thereof at an incline and leads to a stack01' flue extension 6. The walls of the sinuous roasting-chamber arepreferably lined with fire-brick, as shown. Projecting from the convexportions or promontories of the walls of the sinuous chamber areretaining-shoes 8, which are to catch a falling stream of ore and retainthe same in a mass and then deliver the mass gradually in a thin stream.as described hereinafter in the operation. Each shoe is made double andreversiblethat is, it has right and left symmetrical portions, withsymmetrical upper and lower faces preferably concave, as shown.Referring more particularly to Fig. VIII, each shoe comprises a centralcore of metal, such as cast-iron, 9, which has a covering or shell offire-clay 10. Passing longitudinally through the center of each shoe isa hollow shaft 11, and passing longitudinally through the cast-iron corenear each endis a tubular rod 12. The tubular shaft 11 is extendedsomewhat beyond the ends of the shoe and carries wheels 13. (See Fig.III.) The front and back walls of the furnace are provided withhorizontal recesses 14, which have branch vertical slots or recesses 15.Rails 16 are mounted at the bottom of the recesses and are slightlyinclined, and the wheels 13 rest upon the rails 16. Suitable rods 17 areattached loosely to the ends of the tubular shafts 11 and extend backthrough the slots 15, being provided with exposed handles whereby a shoemay be withdrawn when desired, the wheels rolling along the rails.

A walking-beam 18 is provided on each side of the furnace near the upperend, and each walking-beam has connected to its ends rods '19.

2O isarod which connects the walking-beam mounted on the outside of thefurnace and driven by chain from a pinion 22, the pinion 22 being drivenfrom any suitable source of power.

In the present embodiment we have shown four shoes for the sinuouschamber, two shoes being arranged on each side and the shoes of one setbeing staggered with the shoes of the other set. The lower ends of therods 19 and 20 are connected with toggle-levers 23. The toggle-levers 23are constructed as shown in Fig. IX, so that the two members have only alimited flexibility at the joint with respect to each other.

24 designates rods,one of which is provided for each shoe, its outer endhaving ahandle, as shown in Fig. VII, and each rod passes through theperforated end of a toggle 23 and through the adjacent tube 12 of ashoe, thus hinging the shoe to its respectivetoggle-levers. Curved shoes25 are formed through the wall of the furnace concentric with therespective axes of the shoes, and the rods 24 slide through the curvedslots 25 when the shoes are rocked. Links 26 are provided, which areconnected with the toggle-levers by thimbles a (see Fig. VII) and havetheir ends slotted to play over studs 27. The rods 24 pass through thethimbles a. The function of the links 26 is to make a smoother motion ofthe toggles and actuating mechanism and also to take off some of thestrain from the axes of the shoes. The length of the slot in the end ofthe links 26 is sufficiently great to allow for the travel of the rods24.

37 represents rods having slotted ends 38, which receive studs 39, theirother ends being connected to the tubular axes 11 of the'shoes. Theslotted ends allow of the withdrawal of the shoes a certain distance andprevent the accidental dropping of the shoes when removing them.

The upper'shoes of each set are connected to the rods 19 by similartoggle-levers, as shown, and are also connected with links similar tothe links 26, just described.

In order to prevent excessive heating of the retaining-shoes, acoolingagent-such, for instance, as brine may be circulated through the tubularaxes of the shoes and may be conducted thereto by pipes 28.

In the present embodiment we have pro vided four oil-burners, whichproject their flames from opposite walls of the sinuous chamber, andeach oil burner projects its flame underneath a shoe. An air-blast isalso introduced into the chamber underneath each burner through a pipe29. This air-blast forms no part of the burner, being entirelyextraneous of the burner and is introduced not to necessarily promotethe action of the burner, although incidentally it does so, but tocreate a chemical reaction upon the ore, as will be hereinafterdescribed, and we consider this air-blast as an important feature of theinvention, and it should not be confounded with oil-burners which,considered parse, may introduce some air with the flame.

Apair of feed-regulating mills 30 are mounted on the upper end of thefurnace, and the space between them may be regulated by any suitablemeanssuch, for instance, as the screws 31, which controlthe position ofslidable journals 32, in which one of the mills is mounted.

33' designates the spout of ahopper which delivers the ore between themills.

In order to firmly support the side walls of the furnace, iron beams 34are extended across the base 1, and in order to secure and retain andbrace the walls of the furnace braces or tie-bars 35 are employed.

The operation is as follows: Crushed ore is fed through the spout 33between the mills 30,

IIS

the mills 30 being spaced apart only a slight distance preferably togive a stream of ore one-eighth inch thick or thereabout, and the oreissues in a thin stream or veil down through the constricted upperportion of the chamber and strikes upon the uppermost shoe. If theuppermost shoe is in a horizontal position, the stream of ore willcollect upon the shoe, and as the stream of ore drops down the flamepassing up from the flue is projected through the film or veil of ore,is brought into immediate contact therewith and attacks the same, andignites the sulfur and the arsenical or other properties which are to beeliminated. The strong air-blast also drives against the film and forcesout the fumes and also works through the perforated shoe and in drivingup through the mass of ore which has collected upon the shoe clears themass of fumes or sulfur or other elements to be removed. Owing to thesinuosity of the chamber and the presence of the projecting shoes, theflames in their passage up the chamber are deflected many times back andforth, oscillating the flames and giving them a pulsation, so that whenthey strike the ore they envelop the same, and although having a generaldirection through the ore one way the flames attack the ore on bothsides. The sulfurous fumes and other gases which are liberated aredriven by the air-blast up through the flue and dissipated. After acertain amount of ore has been fed in a stream onto the first shoe andhas received its initial heating the shoe is tilted from its horizontalposition to a depressed position, as shown in Fig. IV, and simultane-.ously with this movement of the shoe the other shoes partake ofrelative movements, the shoes on the opposite or front side of thechamber being brought to horizontal position when the shoes on the backside are tilted into an inclined position.

What we claim is 1. In a roasting-furnace, a roasting-chamber havingsinuous walls and a series of perforated retaining shoes pivotallymounted and projecting into the chamber, and means for moving theretaining-shoes.

2. In a roasting-furnace, avertical sinuous chamber, a plurality ofretaining-shoes projecting into the chamber, said shoes being arrangedin two sets, and automatic means for bringing one set to a horizontalposition and simultaneously inclining the shoes ofthe other set.

3. In a roasting-furnace, avertical sinuous chamber, a plurality ofretaining-shoes projecting into the chamber, each retaining-shoe havingsymmetrical portions; a tubular shaft extending longitudinally throughthe shoe, wheels on the ends of the shaft; the walls of the furnacehaving a recess, inclined rails at the bottom of the recess, said wheelsresting on said rails; and means for rocking said shoes.

4:. In a roasting-furnace, a retaining-shoe comprising doublesymmetrical portions, each portion having symmetrical upper and lowerconcave faces, said shoe comprising a metal core and a covering ofinfusible material.

5. In a roasting-furnace, a retaining-shoe comprising double symmetricalportions, each portion having symmetrical upper and lower concave faces,said shoe comprising a metal core and a covering of infusible material,said shoe having vertical perforations.

6. In aroasting-furnace, a vertical chamber, pivoted reversible doubleretaining-shoes projecting into the chamber, and means for controllingthe retaining-shoes.

7. In a roasting-furnace, a vertical sinuous chamber open at both ends,retaining-shoes projecting into the chamber, a flue branching from theupper part of the chamber under the respective shoes, oil-burnersdischarging under the respective shoes, and air-blast pipes discharginginto the chamber under the respective burners.

8. In a roasting-fu rnace, a vertical sinuous chamber, open at bothends, a set of retaining-shoes pivotally mounted and projecting into thechamber from one side, another set of similarly-mounted retaining-shoesprojecting into the chamber from the opposite side, the shoes on oneside being staggered from those on the other side, a walking-beam on thewall of the furnace, connections from the walkingbeam to the respectiveretainingshoes, and means for actuating the walkingbeam.

9. In a roasting-furnace, a vertical sinuous chamber, open at both ends,a set of retaining-shoes pivotally mounted and projecting into thechamber from one side, another set of similarly-mounted retaining-shoesprojecting into the chamber from the opposite side, the shoes on oneside being staggered from those on the other side, a walking-beam on thewall of the furnace, connections from the walkingbeam to the respectiveretaining shoes, and means for actuating the walkingbeam, the walls ofthe furnace having curved slots, concentric with the pivotal axis of theretaining-shoes.

- In testimony whereof we have signed our names to this specification,in the presence of two subscribing witnesses, at Los Angeles, in thecounty of Los Angeles and State of California, this 21st day ofNovember, 1903.

JOSEPH A. ANKER. JAMES H. WATSON. PIERCE EVANS.

Witnesses:

GEORGE T. HAOKLEY, FREDERICK. S. LYONS.

